Machine for forming hollow articles from pulp



(No Model.)

N. P. HANSON.

- MACHINE FOR FORMING HOLLOW ARTICLES FROM PULP.

No. 365,743. Patented June 28, 1887.

22 2 Inventor UNITED STATES ATENT anion.

NE\VEL P. HANSON, OF WATERVILLE, ASSSIGNOR, BY MESNE ASSIGNMENTS, TO THE INDUBATED FIBRE COMPANY, OF PORTLAND, MAINE.

MACHINE FOR FORMING HOLLOW ARTICLES FROM PULP.

SPECIFICATION forming part of Letters Patent No. 365,743, dated June 28, 1887.

Application filed October 20, 1886.

To all whom it may concern.-

Be it known that I, Nnwnr. P. Hanson, a citizen of the United States, residing at \Vaterville, in the county of Kennebec and State of 5 Maine, have invented certain new and useful Improvements in Machines for Forming Hollow Articles from Pulp,- and I do hereby de clare the following to be a full, clear, and X- act description'ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to machines for forming and pressing articles of wood or paper pulp, and it is designed particularly as an im 1 provement to be applied to a machine for forming hollow articles from wood or paper pulp patented to Joseph G. Bodge, October 30, 1883, said Letters Patent being numbered 287,614. In the Bodge machine above mentioned a flexible or elastic diaphragm en veloping a pervious former was used, the whole inclosed in a tight case. Pulp was forced in under pressure between the elastic diaphragm and the pervious former, the diaphragm expanded away from the former and the pulp deposited on its surface, after which a heavy hydrostatic pressure was applied to the outside of the diaphragm, pressing it against the outside of the formed article. By the use of a diaphragm made up wholly of elastic material it was not possible to give to the outside of the article any peculiar form differing from the interior former or core. Neither would the outside surface of the pulp article he as smooth and even as was desirable. In the forming of pails, for instance, the corner around the periphery of the bottom was rounded off and made thinner, and conse quently weaker, than the other portions of the pail, from the fact that the rubber diaphragm drew across this corner with considerable force, and because the drainage at that point was less free than elsewhere. In order to form the chine of the pail a special iron hoop had to be made and put on the pail after the same was formed, this being done not to strengthen the bottom, but to provide the desired form. To remedy this difficulty, I put in the pail-machine a rigid section or head on the inside of the elastic diaphragm and se- Serial No. 216,700. (No model.)

cured thereto, and having around the periphery of its under face a groove, which formed a mold, into which the pulp was compressed to form the chine of-t-he pail, the flat portion of this section forming the pail-bottom. This section is constructed of any suitable rigid or nearly rigid material, and has a smooth under surface.

In the drawings,Figurel represents asection through the Bodge pail-machine with my improvement applied. Fig. 2 illustrates another manner in which it may be used or applied.

0 is the pervious former; F, the elastic diaphragm; A, the outer dome or case; J, the pulp-inlet; I, the pipe for admitting water for hydrostatic pressure, and G is the rigid head secured to the inside of the diaphragm F in such a position that it will come down and form the bottom of the pail. The head G has around the periphery of its under side the groove 9, having the reverse shape of the chine of the pail. As the diphragm is forced inward against the pulp the head G comes down and forms the bottom of the pail, the pulp being forced into the groove 9, thus forming the chine of the pail. If care is taken in having the elastic diaphragm ofuniform thickness, the head G will come down into place each time with little variation, and will not need a centering device. The smooth and rigid surface of the head G gives to the outer surface of the pulp a smoothness which it does not take where it comes in contact with the flexible rubber, and hence it is desirable to use such a rigid section whenever possible in forming pulp by this process.

In Fig. 2 is illustrated a machine where a considerable portion of the diaphragm is made up of a rigid section, the dotted lines showing the position taken by the flexible portion of go the diaphragm after the outside hydrostatic pressure is applied. Even when the outside of the pulp does not need to have a special form given to it which is different from the inner surface, it is useful to have this rigid section as large as possible, because that portion formed by this section will have a smooth surface, requiring but little finishing,whereas those parts which are formed by the elastic portion of the diaphragm are quite rough and uneven and require to be worked down by elastic diaphragm outside of said former and sand-paper or other means to a considerable having attached to it a rigid section or head, extent. I I an exterior dome or case, means for applying I 5 Pneumatic or hydrostatic pressure may be hydrostatic or pneumatic pressure outside of 5 used equally wel on the outside of the diasaid diaphragm, and means for introducing phragm. the pulp, substantially as described.

My invention may be applied to a great va- In testimony whereof I affix my signature in riety of machines for forming hollow articles. presence of two witnesses.

I claim- NEWEL P. HANSON. IO In a machine for forming hollow articles Witnesses: y

from pulp, a pervious former on the exterior HELEN NEIL BATEs, surface of which the pulp is deposited, an HATTIE S. Burns. 

